4.16-stable review patch. If anyone has any objections, please let me know.
------------------ From: Rafael J. Wysocki <rafael.j.wyso...@intel.com> commit c62ec4610c40bcc44f2d3d5ed1c312737279e2f3 upstream. Commit 08810a4119aa (PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags) inadvertently prevented the power.direct_complete flag from being set for devices without PM callbacks and with disabled runtime PM which also prevents power.direct_complete from being set for their parents. That led to problems including a resume crash on HP ZBook 14u. Restore the previous behavior by causing power.direct_complete to be set for those devices again, but do that in a more direct way to avoid overlooking that case in the future. Link: https://bugzilla.kernel.org/show_bug.cgi?id=199693 Fixes: 08810a4119aa (PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags) Reported-by: Thomas Martitz <ku...@rockbox.org> Tested-by: Thomas Martitz <ku...@rockbox.org> Cc: 4.15+ <sta...@vger.kernel.org> # 4.15+ Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> Reviewed-by: Ulf Hansson <ulf.hans...@linaro.org> Reviewed-by: Johan Hovold <jo...@kernel.org> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/base/power/main.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1923,10 +1923,8 @@ static int device_prepare(struct device dev->power.wakeup_path = false; - if (dev->power.no_pm_callbacks) { - ret = 1; /* Let device go direct_complete */ + if (dev->power.no_pm_callbacks) goto unlock; - } if (dev->pm_domain) callback = dev->pm_domain->ops.prepare; @@ -1960,7 +1958,8 @@ unlock: */ spin_lock_irq(&dev->power.lock); dev->power.direct_complete = state.event == PM_EVENT_SUSPEND && - pm_runtime_suspended(dev) && ret > 0 && + ((pm_runtime_suspended(dev) && ret > 0) || + dev->power.no_pm_callbacks) && !dev_pm_test_driver_flags(dev, DPM_FLAG_NEVER_SKIP); spin_unlock_irq(&dev->power.lock); return 0;
